Botryoidal chalcedony (possible seam agate)
Microcrystalline quartz, SiO₂; commonly with iron-oxide and clay inclusions
mineral
Category
Mineral (Variety Of Chalcedony)
Browse mineral (variety of chalcedony) specimens identified by the Rock Identifier community.
Learn about Mineral (Variety Of Chalcedony) in the encyclopedia
View all →
Chalcedony (Agate/Carnelian variant)
Silicon Dioxide (SiO2)
mineral
Mixed Rock Collection (Pebbles and Stones)
Various geological specimens
igneous, sedimentary, and metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Amazonite
K(AlSi3O8) - Microcline
mineral
Dalmatian Jasper
Feldspar porphyry (Microcline and Quartz with Arfvedsonite spots)
igneous
Green Moss Agate
Agate (Silicon Dioxide, SiO2) with inclusions
mineral
Chert
Silicon Dioxide (Microcrystalline Quartz, $SiO_2$)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Pyrite
Iron Sulfide (FeS2)
mineral
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Flint / Chert
Silicon dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Flint
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Chert (Nodule)
Chert (SiO2)
sedimentary
Polished pink quartzite or jasper
Quartzite, predominantly SiO₂; possibly iron-stained jasper/chalcedony
metamorphic
Carnelian (Agate)
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Petrified Dinosaur Bone (Gembone)
Agatized Dinosaur Bone
sedimentary
Green Moss Agate
Silicon Dioxide with inclusions (SiO2 + Mn/Fe)
sedimentary
Chalcedony (Agate) Pebble
Silicon Dioxide (SiO2)
mineral
Bloodstone
Chalcedony (cryptocrystalline quartz)
Mineral/Semiprecious Stone
Polished tree agate (likely)
Chalcedony (microcrystalline SiO₂) with green dendritic/inclusion minerals
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace Titanium, Manganese, or Iron
mineral
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2
metamorphic
Peridot
Olivine (Mg, Fe)₂SiO₄
mineral
Tumbled Stone Collection (featuring Tiger's Eye, Rose Quartz, and Moss Agate)
Mixed Silicates and Oxides (predominantly SiO2 group minerals)
mineral
White Chalcedony
Silicon Dioxide (SiO2)
mineral
Rough Corundum (Sapphire/Ruby mixture)
Corundum (Aluminum Oxide, Al2O3)
mineral
Fossil Coral
Rugosa or Tabulata / Hexacorallia (replaced with silica or calcite)
fossil
Pyrite
Iron sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite (Tumbled)
Iron Disulfide (FeS2)
mineral
Pyrite in Matrix
Iron Sulfide (FeS2)
mineral
Quartz (Milky / Clear Quartz Fragment)
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Dyed Agate / Quartz
Silicon Dioxide (SiO2) with artificial dye
mineral
Sphalerite with Agate and Druzy Quartz
Zinc Sulfide (ZnS) with Silicon Dioxide (SiO2)
mineral
Banded Agate (Tumbled)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Chert / Chalcedony (likely carnelian or flint variety)
Silicon Dioxide (SiO2)
sedimentary
Weathered agate or chalcedony nodule
Microcrystalline quartz (SiO₂), likely agate/chalcedony with iron-oxide staining
mineral